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3 After measuring the CO
percentage and adjusting the setting,
2
put the cover cap and the sampling point back in their place.
Make sure they are gastight.
4 Select High setting by simultaneously pressing
Capital will appear on the service display.
5 Measure the CO
percentage. If the CO
2
deviates from the values in the table indicating the CO
percentage at maximum power, contact your local dealer.
6 Press
and
simultaneously to exit the test program.
7 Put the front panel back in its place.
11
Operation
11.1
Overview: Operation
The gas boiler is a modulating, high-efficiency boiler. This means
that the power is adjusted in line with the desired heat requirement.
The aluminium heat exchanger has 2 separate copper circuits. As a
result of the separately constructed circuits for space heating and
domestic hot water, the heating and the hot water supply can
operate independently, but not simultaneously.
The gas boiler has an electronic boiler controller which does the
following when heating or hot water supply is required:
▪ starting the fan,
▪ opening the gas valve,
▪ igniting the burner,
▪ constantly monitoring and controlling the flame.
It is possible to use the domestic hot water circuit of the gas boiler
without connecting and filling the space heating system.
11.2
Heating
Heating is controlled by the outdoor unit. The boiler will start-up the
heating process when there is a request from the outdoor unit.
INFORMATION
For third-party gas boilers, prolonged boiler operation at
low outdoor temperatures might be temporarily interrupted
to protect the outdoor unit and water piping from freezing.
During this temporary interruption the boiler might appear
to be off.
11.3
Domestic hot water
Not applicable for Switzerland
Instant domestic hot water is supplied by the boiler. When a
simultaneous demand of space heating and domestic hot water
occurs, domestic hot water has priority over space heating.
This manual only explains the domestic hot water making without
having a domestic hot water tank combined with the system. For the
operation and needed settings of domestic hot water in combination
with a domestic hot water tank needed for Switzerland, please see
the manual of the heat pump module.
INFORMATION
For NHY2KOMB28+32AA, prolonged instant domestic hot
water operation at low outdoor temperatures might be
temporarily interrupted to protect the outdoor unit and
water piping from freezing.
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
11.3.1
Not applicable for Switzerland
and
twice.
l/min
15
percentage still
2
13
2
11
9
7
5
3
1
0.2
0
The minimum flow for domestic hot water operation is 2 l/min. The
minimum pressure is 0.1 bar. A low flow (<5 l/min) can reduce
comfort. Make sure to set the setpoint high enough.
11.4
The following codes on the service display indicate the following
operating modes.
Off
The gas boiler is out of operation but is supplied with electric power.
There will be no response on space heating and/or domestic hot
water demands. Frost protection is active. This means that the
exchanger is heated up if the water temperature in the gas boiler is
too low. If applicable, the keep hot function will also be active.
If frost protection or keep hot function is activated, will be displayed
(heating the exchanger). In this mode, the pressure (bar) in the
space heating installation can be read on the main display.
Waiting mode (blank service display)
The LED at the
the domestic hot water comfort function. The gas boiler is waiting for
a space heating and/or domestic hot water demand.
Pump overrun of space heating
After each space heating operation, the pump continues to run. This
function is controlled by the outdoor unit.
Boiler shutdown when the required temperature is reached
The boiler controller can temporarily stop the requested space
heating demand. The burner will stop. The shutdown occurs
because the requested temperature is reached. When the
temperature drops too fast and the anti-cycle time has passed, the
shutdown will be cancelled.
Self-test
The sensors check the boiler controller. During the check-up, the
boiler controller does NOT perform any other tasks.
Ventilation
When the appliance is started, the fan goes to starting speed. When
the starting speed is reached, the burner is lit. The code will also be
visible when post-ventilation is taking place after the burner has
stopped.
Ignition
When the fan has reached its starting speed, the burner is ignited by
means of electric sparks. During ignition the code will be visible on
the service display. If the burner does NOT ignite, a new ignition
attempt occurs after 15 seconds. If after 4 ignition attempts the
burner is NOT yet burning, the boiler will go into fault mode.
Flow resistance graph for appliance
domestic hot water circuit
0.4
0.6
0.8
1.0
1.2
1.4
1.6
A
28 kW
B
32 kW
Operation modes
button is lit and possibly also one of the LEDs for
11 Operation
B
A
bar
1.8
2.0
Installer reference guide
77
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